1 // SPDX-License-Identifier: GPL-2.0-only
3 * DMA driver for NVIDIA Tegra GPC DMA controller.
5 * Copyright (c) 2014-2022, NVIDIA CORPORATION. All rights reserved.
8 #include <linux/bitfield.h>
9 #include <linux/dmaengine.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/interrupt.h>
12 #include <linux/iommu.h>
13 #include <linux/iopoll.h>
14 #include <linux/minmax.h>
15 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/of_dma.h>
18 #include <linux/platform_device.h>
19 #include <linux/reset.h>
20 #include <linux/slab.h>
21 #include <dt-bindings/memory/tegra186-mc.h>
25 #define TEGRA_GPCDMA_CHAN_CSR 0x00
26 #define TEGRA_GPCDMA_CSR_ENB BIT(31)
27 #define TEGRA_GPCDMA_CSR_IE_EOC BIT(30)
28 #define TEGRA_GPCDMA_CSR_ONCE BIT(27)
30 #define TEGRA_GPCDMA_CSR_FC_MODE GENMASK(25, 24)
31 #define TEGRA_GPCDMA_CSR_FC_MODE_NO_MMIO \
32 FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 0)
33 #define TEGRA_GPCDMA_CSR_FC_MODE_ONE_MMIO \
34 FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 1)
35 #define TEGRA_GPCDMA_CSR_FC_MODE_TWO_MMIO \
36 FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 2)
37 #define TEGRA_GPCDMA_CSR_FC_MODE_FOUR_MMIO \
38 FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 3)
40 #define TEGRA_GPCDMA_CSR_DMA GENMASK(23, 21)
41 #define TEGRA_GPCDMA_CSR_DMA_IO2MEM_NO_FC \
42 FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 0)
43 #define TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC \
44 FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 1)
45 #define TEGRA_GPCDMA_CSR_DMA_MEM2IO_NO_FC \
46 FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 2)
47 #define TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC \
48 FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 3)
49 #define TEGRA_GPCDMA_CSR_DMA_MEM2MEM \
50 FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 4)
51 #define TEGRA_GPCDMA_CSR_DMA_FIXED_PAT \
52 FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 6)
54 #define TEGRA_GPCDMA_CSR_REQ_SEL_MASK GENMASK(20, 16)
55 #define TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED \
56 FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, 4)
57 #define TEGRA_GPCDMA_CSR_IRQ_MASK BIT(15)
58 #define TEGRA_GPCDMA_CSR_WEIGHT GENMASK(13, 10)
61 #define TEGRA_GPCDMA_CHAN_STATUS 0x004
62 #define TEGRA_GPCDMA_STATUS_BUSY BIT(31)
63 #define TEGRA_GPCDMA_STATUS_ISE_EOC BIT(30)
64 #define TEGRA_GPCDMA_STATUS_PING_PONG BIT(28)
65 #define TEGRA_GPCDMA_STATUS_DMA_ACTIVITY BIT(27)
66 #define TEGRA_GPCDMA_STATUS_CHANNEL_PAUSE BIT(26)
67 #define TEGRA_GPCDMA_STATUS_CHANNEL_RX BIT(25)
68 #define TEGRA_GPCDMA_STATUS_CHANNEL_TX BIT(24)
69 #define TEGRA_GPCDMA_STATUS_IRQ_INTR_STA BIT(23)
70 #define TEGRA_GPCDMA_STATUS_IRQ_STA BIT(21)
71 #define TEGRA_GPCDMA_STATUS_IRQ_TRIG_STA BIT(20)
73 #define TEGRA_GPCDMA_CHAN_CSRE 0x008
74 #define TEGRA_GPCDMA_CHAN_CSRE_PAUSE BIT(31)
77 #define TEGRA_GPCDMA_CHAN_SRC_PTR 0x00C
79 /* Destination address */
80 #define TEGRA_GPCDMA_CHAN_DST_PTR 0x010
82 /* High address pointer */
83 #define TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR 0x014
84 #define TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR GENMASK(7, 0)
85 #define TEGRA_GPCDMA_HIGH_ADDR_DST_PTR GENMASK(23, 16)
87 /* MC sequence register */
88 #define TEGRA_GPCDMA_CHAN_MCSEQ 0x18
89 #define TEGRA_GPCDMA_MCSEQ_DATA_SWAP BIT(31)
90 #define TEGRA_GPCDMA_MCSEQ_REQ_COUNT GENMASK(30, 25)
91 #define TEGRA_GPCDMA_MCSEQ_BURST GENMASK(24, 23)
92 #define TEGRA_GPCDMA_MCSEQ_BURST_2 \
93 FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 0)
94 #define TEGRA_GPCDMA_MCSEQ_BURST_16 \
95 FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 3)
96 #define TEGRA_GPCDMA_MCSEQ_WRAP1 GENMASK(22, 20)
97 #define TEGRA_GPCDMA_MCSEQ_WRAP0 GENMASK(19, 17)
98 #define TEGRA_GPCDMA_MCSEQ_WRAP_NONE 0
100 #define TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK GENMASK(13, 7)
101 #define TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK GENMASK(6, 0)
103 /* MMIO sequence register */
104 #define TEGRA_GPCDMA_CHAN_MMIOSEQ 0x01c
105 #define TEGRA_GPCDMA_MMIOSEQ_DBL_BUF BIT(31)
106 #define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH GENMASK(30, 28)
107 #define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8 \
108 FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 0)
109 #define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16 \
110 FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 1)
111 #define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32 \
112 FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 2)
113 #define TEGRA_GPCDMA_MMIOSEQ_DATA_SWAP BIT(27)
114 #define TEGRA_GPCDMA_MMIOSEQ_BURST_SHIFT 23
115 #define TEGRA_GPCDMA_MMIOSEQ_BURST_MIN 2U
116 #define TEGRA_GPCDMA_MMIOSEQ_BURST_MAX 32U
117 #define TEGRA_GPCDMA_MMIOSEQ_BURST(bs) \
118 (GENMASK((fls(bs) - 2), 0) << TEGRA_GPCDMA_MMIOSEQ_BURST_SHIFT)
119 #define TEGRA_GPCDMA_MMIOSEQ_MASTER_ID GENMASK(22, 19)
120 #define TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD GENMASK(18, 16)
121 #define TEGRA_GPCDMA_MMIOSEQ_MMIO_PROT GENMASK(8, 7)
124 #define TEGRA_GPCDMA_CHAN_WCOUNT 0x20
127 #define TEGRA_GPCDMA_CHAN_XFER_COUNT 0x24
129 /* DMA byte count status */
130 #define TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS 0x28
132 /* Error Status Register */
133 #define TEGRA_GPCDMA_CHAN_ERR_STATUS 0x30
134 #define TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT 8
135 #define TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK 0xF
136 #define TEGRA_GPCDMA_CHAN_ERR_TYPE(err) ( \
137 ((err) >> TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT) & \
138 TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK)
139 #define TEGRA_DMA_BM_FIFO_FULL_ERR 0xF
140 #define TEGRA_DMA_PERIPH_FIFO_FULL_ERR 0xE
141 #define TEGRA_DMA_PERIPH_ID_ERR 0xD
142 #define TEGRA_DMA_STREAM_ID_ERR 0xC
143 #define TEGRA_DMA_MC_SLAVE_ERR 0xB
144 #define TEGRA_DMA_MMIO_SLAVE_ERR 0xA
147 #define TEGRA_GPCDMA_CHAN_FIXED_PATTERN 0x34
149 #define TEGRA_GPCDMA_CHAN_TZ 0x38
150 #define TEGRA_GPCDMA_CHAN_TZ_MMIO_PROT_1 BIT(0)
151 #define TEGRA_GPCDMA_CHAN_TZ_MC_PROT_1 BIT(1)
153 #define TEGRA_GPCDMA_CHAN_SPARE 0x3c
154 #define TEGRA_GPCDMA_CHAN_SPARE_EN_LEGACY_FC BIT(16)
157 * If any burst is in flight and DMA paused then this is the time to complete
158 * on-flight burst and update DMA status register.
160 #define TEGRA_GPCDMA_BURST_COMPLETE_TIME 10
161 #define TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT 5000 /* 5 msec */
163 /* Channel base address offset from GPCDMA base address */
164 #define TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET 0x20000
167 struct tegra_dma_channel;
170 * tegra_dma_chip_data Tegra chip specific DMA data
171 * @nr_channels: Number of channels available in the controller.
172 * @channel_reg_size: Channel register size.
173 * @max_dma_count: Maximum DMA transfer count supported by DMA controller.
174 * @hw_support_pause: DMA HW engine support pause of the channel.
176 struct tegra_dma_chip_data {
177 bool hw_support_pause;
178 unsigned int nr_channels;
179 unsigned int channel_reg_size;
180 unsigned int max_dma_count;
181 int (*terminate)(struct tegra_dma_channel *tdc);
184 /* DMA channel registers */
185 struct tegra_dma_channel_regs {
197 * tegra_dma_sg_req: DMA request details to configure hardware. This
198 * contains the details for one transfer to configure DMA hw.
199 * The client's request for data transfer can be broken into multiple
200 * sub-transfer as per requester details and hw support. This sub transfer
201 * get added as an array in Tegra DMA desc which manages the transfer details.
203 struct tegra_dma_sg_req {
205 struct tegra_dma_channel_regs ch_regs;
209 * tegra_dma_desc: Tegra DMA descriptors which uses virt_dma_desc to
210 * manage client request and keep track of transfer status, callbacks
211 * and request counts etc.
213 struct tegra_dma_desc {
215 unsigned int bytes_req;
216 unsigned int bytes_xfer;
218 unsigned int sg_count;
219 struct virt_dma_desc vd;
220 struct tegra_dma_channel *tdc;
221 struct tegra_dma_sg_req sg_req[];
225 * tegra_dma_channel: Channel specific information
227 struct tegra_dma_channel {
230 enum dma_transfer_direction sid_dir;
234 struct tegra_dma *tdma;
235 struct virt_dma_chan vc;
236 struct tegra_dma_desc *dma_desc;
237 struct dma_slave_config dma_sconfig;
238 unsigned int stream_id;
239 unsigned long chan_base_offset;
243 * tegra_dma: Tegra DMA specific information
246 const struct tegra_dma_chip_data *chip_data;
247 unsigned long sid_m2d_reserved;
248 unsigned long sid_d2m_reserved;
249 void __iomem *base_addr;
251 struct dma_device dma_dev;
252 struct reset_control *rst;
253 struct tegra_dma_channel channels[];
256 static inline void tdc_write(struct tegra_dma_channel *tdc,
259 writel_relaxed(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
262 static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
264 return readl_relaxed(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
267 static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
269 return container_of(dc, struct tegra_dma_channel, vc.chan);
272 static inline struct tegra_dma_desc *vd_to_tegra_dma_desc(struct virt_dma_desc *vd)
274 return container_of(vd, struct tegra_dma_desc, vd);
277 static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
279 return tdc->vc.chan.device->dev;
282 static void tegra_dma_dump_chan_regs(struct tegra_dma_channel *tdc)
284 dev_dbg(tdc2dev(tdc), "DMA Channel %d name %s register dump:\n",
286 dev_dbg(tdc2dev(tdc), "CSR %x STA %x CSRE %x SRC %x DST %x\n",
287 tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR),
288 tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS),
289 tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE),
290 tdc_read(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR),
291 tdc_read(tdc, TEGRA_GPCDMA_CHAN_DST_PTR)
293 dev_dbg(tdc2dev(tdc), "MCSEQ %x IOSEQ %x WCNT %x XFER %x BSTA %x\n",
294 tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ),
295 tdc_read(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ),
296 tdc_read(tdc, TEGRA_GPCDMA_CHAN_WCOUNT),
297 tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT),
298 tdc_read(tdc, TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS)
300 dev_dbg(tdc2dev(tdc), "DMA ERR_STA %x\n",
301 tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS));
304 static int tegra_dma_sid_reserve(struct tegra_dma_channel *tdc,
305 enum dma_transfer_direction direction)
307 struct tegra_dma *tdma = tdc->tdma;
308 int sid = tdc->slave_id;
310 if (!is_slave_direction(direction))
315 if (test_and_set_bit(sid, &tdma->sid_m2d_reserved)) {
316 dev_err(tdma->dev, "slave id already in use\n");
321 if (test_and_set_bit(sid, &tdma->sid_d2m_reserved)) {
322 dev_err(tdma->dev, "slave id already in use\n");
330 tdc->sid_dir = direction;
335 static void tegra_dma_sid_free(struct tegra_dma_channel *tdc)
337 struct tegra_dma *tdma = tdc->tdma;
338 int sid = tdc->slave_id;
340 switch (tdc->sid_dir) {
342 clear_bit(sid, &tdma->sid_m2d_reserved);
345 clear_bit(sid, &tdma->sid_d2m_reserved);
351 tdc->sid_dir = DMA_TRANS_NONE;
354 static void tegra_dma_desc_free(struct virt_dma_desc *vd)
356 kfree(container_of(vd, struct tegra_dma_desc, vd));
359 static int tegra_dma_slave_config(struct dma_chan *dc,
360 struct dma_slave_config *sconfig)
362 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
364 memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
365 tdc->config_init = true;
370 static int tegra_dma_pause(struct tegra_dma_channel *tdc)
375 val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE);
376 val |= TEGRA_GPCDMA_CHAN_CSRE_PAUSE;
377 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, val);
379 /* Wait until busy bit is de-asserted */
380 ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
381 tdc->chan_base_offset + TEGRA_GPCDMA_CHAN_STATUS,
383 !(val & TEGRA_GPCDMA_STATUS_BUSY),
384 TEGRA_GPCDMA_BURST_COMPLETE_TIME,
385 TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
388 dev_err(tdc2dev(tdc), "DMA pause timed out\n");
389 tegra_dma_dump_chan_regs(tdc);
395 static int tegra_dma_device_pause(struct dma_chan *dc)
397 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
401 if (!tdc->tdma->chip_data->hw_support_pause)
404 spin_lock_irqsave(&tdc->vc.lock, flags);
405 ret = tegra_dma_pause(tdc);
406 spin_unlock_irqrestore(&tdc->vc.lock, flags);
411 static void tegra_dma_resume(struct tegra_dma_channel *tdc)
415 val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE);
416 val &= ~TEGRA_GPCDMA_CHAN_CSRE_PAUSE;
417 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, val);
420 static int tegra_dma_device_resume(struct dma_chan *dc)
422 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
425 if (!tdc->tdma->chip_data->hw_support_pause)
428 spin_lock_irqsave(&tdc->vc.lock, flags);
429 tegra_dma_resume(tdc);
430 spin_unlock_irqrestore(&tdc->vc.lock, flags);
435 static inline int tegra_dma_pause_noerr(struct tegra_dma_channel *tdc)
437 /* Return 0 irrespective of PAUSE status.
438 * This is useful to recover channels that can exit out of flush
439 * state when the channel is disabled.
442 tegra_dma_pause(tdc);
446 static void tegra_dma_disable(struct tegra_dma_channel *tdc)
450 csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
452 /* Disable interrupts */
453 csr &= ~TEGRA_GPCDMA_CSR_IE_EOC;
456 csr &= ~TEGRA_GPCDMA_CSR_ENB;
457 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
459 /* Clear interrupt status if it is there */
460 status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
461 if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
462 dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
463 tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS, status);
467 static void tegra_dma_configure_next_sg(struct tegra_dma_channel *tdc)
469 struct tegra_dma_desc *dma_desc = tdc->dma_desc;
470 struct tegra_dma_channel_regs *ch_regs;
476 /* Reset the sg index for cyclic transfers */
477 if (dma_desc->sg_idx == dma_desc->sg_count)
478 dma_desc->sg_idx = 0;
480 /* Configure next transfer immediately after DMA is busy */
481 ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
482 tdc->chan_base_offset + TEGRA_GPCDMA_CHAN_STATUS,
484 (val & TEGRA_GPCDMA_STATUS_BUSY), 0,
485 TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
489 ch_regs = &dma_desc->sg_req[dma_desc->sg_idx].ch_regs;
491 tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_regs->wcount);
492 tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_regs->src_ptr);
493 tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_regs->dst_ptr);
494 tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR, ch_regs->high_addr_ptr);
497 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
498 ch_regs->csr | TEGRA_GPCDMA_CSR_ENB);
501 static void tegra_dma_start(struct tegra_dma_channel *tdc)
503 struct tegra_dma_desc *dma_desc = tdc->dma_desc;
504 struct tegra_dma_channel_regs *ch_regs;
505 struct virt_dma_desc *vdesc;
508 vdesc = vchan_next_desc(&tdc->vc);
512 dma_desc = vd_to_tegra_dma_desc(vdesc);
513 list_del(&vdesc->node);
515 tdc->dma_desc = dma_desc;
517 tegra_dma_resume(tdc);
520 ch_regs = &dma_desc->sg_req[dma_desc->sg_idx].ch_regs;
522 tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_regs->wcount);
523 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, 0);
524 tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_regs->src_ptr);
525 tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_regs->dst_ptr);
526 tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR, ch_regs->high_addr_ptr);
527 tdc_write(tdc, TEGRA_GPCDMA_CHAN_FIXED_PATTERN, ch_regs->fixed_pattern);
528 tdc_write(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ, ch_regs->mmio_seq);
529 tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, ch_regs->mc_seq);
530 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, ch_regs->csr);
533 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
534 ch_regs->csr | TEGRA_GPCDMA_CSR_ENB);
537 static void tegra_dma_xfer_complete(struct tegra_dma_channel *tdc)
539 vchan_cookie_complete(&tdc->dma_desc->vd);
541 tegra_dma_sid_free(tdc);
542 tdc->dma_desc = NULL;
545 static void tegra_dma_chan_decode_error(struct tegra_dma_channel *tdc,
546 unsigned int err_status)
548 switch (TEGRA_GPCDMA_CHAN_ERR_TYPE(err_status)) {
549 case TEGRA_DMA_BM_FIFO_FULL_ERR:
550 dev_err(tdc->tdma->dev,
551 "GPCDMA CH%d bm fifo full\n", tdc->id);
554 case TEGRA_DMA_PERIPH_FIFO_FULL_ERR:
555 dev_err(tdc->tdma->dev,
556 "GPCDMA CH%d peripheral fifo full\n", tdc->id);
559 case TEGRA_DMA_PERIPH_ID_ERR:
560 dev_err(tdc->tdma->dev,
561 "GPCDMA CH%d illegal peripheral id\n", tdc->id);
564 case TEGRA_DMA_STREAM_ID_ERR:
565 dev_err(tdc->tdma->dev,
566 "GPCDMA CH%d illegal stream id\n", tdc->id);
569 case TEGRA_DMA_MC_SLAVE_ERR:
570 dev_err(tdc->tdma->dev,
571 "GPCDMA CH%d mc slave error\n", tdc->id);
574 case TEGRA_DMA_MMIO_SLAVE_ERR:
575 dev_err(tdc->tdma->dev,
576 "GPCDMA CH%d mmio slave error\n", tdc->id);
580 dev_err(tdc->tdma->dev,
581 "GPCDMA CH%d security violation %x\n", tdc->id,
586 static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
588 struct tegra_dma_channel *tdc = dev_id;
589 struct tegra_dma_desc *dma_desc = tdc->dma_desc;
590 struct tegra_dma_sg_req *sg_req;
593 /* Check channel error status register */
594 status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS);
596 tegra_dma_chan_decode_error(tdc, status);
597 tegra_dma_dump_chan_regs(tdc);
598 tdc_write(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS, 0xFFFFFFFF);
601 spin_lock(&tdc->vc.lock);
602 status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
603 if (!(status & TEGRA_GPCDMA_STATUS_ISE_EOC))
606 tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS,
607 TEGRA_GPCDMA_STATUS_ISE_EOC);
612 sg_req = dma_desc->sg_req;
613 dma_desc->bytes_xfer += sg_req[dma_desc->sg_idx].len;
615 if (dma_desc->cyclic) {
616 vchan_cyclic_callback(&dma_desc->vd);
617 tegra_dma_configure_next_sg(tdc);
620 if (dma_desc->sg_idx == dma_desc->sg_count)
621 tegra_dma_xfer_complete(tdc);
623 tegra_dma_start(tdc);
627 spin_unlock(&tdc->vc.lock);
631 static void tegra_dma_issue_pending(struct dma_chan *dc)
633 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
639 spin_lock_irqsave(&tdc->vc.lock, flags);
640 if (vchan_issue_pending(&tdc->vc))
641 tegra_dma_start(tdc);
644 * For cyclic DMA transfers, program the second
645 * transfer parameters as soon as the first DMA
646 * transfer is started inorder for the DMA
647 * controller to trigger the second transfer
648 * with the correct parameters.
650 if (tdc->dma_desc && tdc->dma_desc->cyclic)
651 tegra_dma_configure_next_sg(tdc);
653 spin_unlock_irqrestore(&tdc->vc.lock, flags);
656 static int tegra_dma_stop_client(struct tegra_dma_channel *tdc)
662 * Change the client associated with the DMA channel
663 * to stop DMA engine from starting any more bursts for
664 * the given client and wait for in flight bursts to complete
666 csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
667 csr &= ~(TEGRA_GPCDMA_CSR_REQ_SEL_MASK);
668 csr |= TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED;
669 tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
671 /* Wait for in flight data transfer to finish */
672 udelay(TEGRA_GPCDMA_BURST_COMPLETE_TIME);
674 /* If TX/RX path is still active wait till it becomes
678 ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
679 tdc->chan_base_offset +
680 TEGRA_GPCDMA_CHAN_STATUS,
682 !(status & (TEGRA_GPCDMA_STATUS_CHANNEL_TX |
683 TEGRA_GPCDMA_STATUS_CHANNEL_RX)),
685 TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
687 dev_err(tdc2dev(tdc), "Timeout waiting for DMA burst completion!\n");
688 tegra_dma_dump_chan_regs(tdc);
694 static int tegra_dma_terminate_all(struct dma_chan *dc)
696 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
701 spin_lock_irqsave(&tdc->vc.lock, flags);
704 err = tdc->tdma->chip_data->terminate(tdc);
706 spin_unlock_irqrestore(&tdc->vc.lock, flags);
710 vchan_terminate_vdesc(&tdc->dma_desc->vd);
711 tegra_dma_disable(tdc);
712 tdc->dma_desc = NULL;
715 tegra_dma_sid_free(tdc);
716 vchan_get_all_descriptors(&tdc->vc, &head);
717 spin_unlock_irqrestore(&tdc->vc.lock, flags);
719 vchan_dma_desc_free_list(&tdc->vc, &head);
724 static int tegra_dma_get_residual(struct tegra_dma_channel *tdc)
726 struct tegra_dma_desc *dma_desc = tdc->dma_desc;
727 struct tegra_dma_sg_req *sg_req = dma_desc->sg_req;
728 unsigned int bytes_xfer, residual;
729 u32 wcount = 0, status;
731 wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT);
734 * Set wcount = 0 if EOC bit is set. The transfer would have
735 * already completed and the CHAN_XFER_COUNT could have updated
736 * for the next transfer, specifically in case of cyclic transfers.
738 status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
739 if (status & TEGRA_GPCDMA_STATUS_ISE_EOC)
742 bytes_xfer = dma_desc->bytes_xfer +
743 sg_req[dma_desc->sg_idx].len - (wcount * 4);
745 residual = dma_desc->bytes_req - (bytes_xfer % dma_desc->bytes_req);
750 static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
752 struct dma_tx_state *txstate)
754 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
755 struct tegra_dma_desc *dma_desc;
756 struct virt_dma_desc *vd;
757 unsigned int residual;
761 ret = dma_cookie_status(dc, cookie, txstate);
762 if (ret == DMA_COMPLETE)
765 spin_lock_irqsave(&tdc->vc.lock, flags);
766 vd = vchan_find_desc(&tdc->vc, cookie);
768 dma_desc = vd_to_tegra_dma_desc(vd);
769 residual = dma_desc->bytes_req;
770 dma_set_residue(txstate, residual);
771 } else if (tdc->dma_desc && tdc->dma_desc->vd.tx.cookie == cookie) {
772 residual = tegra_dma_get_residual(tdc);
773 dma_set_residue(txstate, residual);
775 dev_err(tdc2dev(tdc), "cookie %d is not found\n", cookie);
777 spin_unlock_irqrestore(&tdc->vc.lock, flags);
782 static inline int get_bus_width(struct tegra_dma_channel *tdc,
783 enum dma_slave_buswidth slave_bw)
786 case DMA_SLAVE_BUSWIDTH_1_BYTE:
787 return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8;
788 case DMA_SLAVE_BUSWIDTH_2_BYTES:
789 return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16;
790 case DMA_SLAVE_BUSWIDTH_4_BYTES:
791 return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32;
793 dev_err(tdc2dev(tdc), "given slave bus width is not supported\n");
798 static unsigned int get_burst_size(struct tegra_dma_channel *tdc,
799 u32 burst_size, enum dma_slave_buswidth slave_bw,
802 unsigned int burst_mmio_width, burst_byte;
805 * burst_size from client is in terms of the bus_width.
806 * convert that into words.
807 * If burst_size is not specified from client, then use
808 * len to calculate the optimum burst size
810 burst_byte = burst_size ? burst_size * slave_bw : len;
811 burst_mmio_width = burst_byte / 4;
813 if (burst_mmio_width < TEGRA_GPCDMA_MMIOSEQ_BURST_MIN)
816 burst_mmio_width = min(burst_mmio_width, TEGRA_GPCDMA_MMIOSEQ_BURST_MAX);
818 return TEGRA_GPCDMA_MMIOSEQ_BURST(burst_mmio_width);
821 static int get_transfer_param(struct tegra_dma_channel *tdc,
822 enum dma_transfer_direction direction,
826 unsigned int *burst_size,
827 enum dma_slave_buswidth *slave_bw)
831 *apb_addr = tdc->dma_sconfig.dst_addr;
832 *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
833 *burst_size = tdc->dma_sconfig.dst_maxburst;
834 *slave_bw = tdc->dma_sconfig.dst_addr_width;
835 *csr = TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC;
838 *apb_addr = tdc->dma_sconfig.src_addr;
839 *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
840 *burst_size = tdc->dma_sconfig.src_maxburst;
841 *slave_bw = tdc->dma_sconfig.src_addr_width;
842 *csr = TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC;
845 dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
851 static struct dma_async_tx_descriptor *
852 tegra_dma_prep_dma_memset(struct dma_chan *dc, dma_addr_t dest, int value,
853 size_t len, unsigned long flags)
855 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
856 unsigned int max_dma_count = tdc->tdma->chip_data->max_dma_count;
857 struct tegra_dma_sg_req *sg_req;
858 struct tegra_dma_desc *dma_desc;
861 if ((len & 3) || (dest & 3) || len > max_dma_count) {
862 dev_err(tdc2dev(tdc),
863 "DMA length/memory address is not supported\n");
867 /* Set DMA mode to fixed pattern */
868 csr = TEGRA_GPCDMA_CSR_DMA_FIXED_PAT;
869 /* Enable once or continuous mode */
870 csr |= TEGRA_GPCDMA_CSR_ONCE;
871 /* Enable IRQ mask */
872 csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
873 /* Enable the DMA interrupt */
874 if (flags & DMA_PREP_INTERRUPT)
875 csr |= TEGRA_GPCDMA_CSR_IE_EOC;
876 /* Configure default priority weight for the channel */
877 csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
879 mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
880 /* retain stream-id and clean rest */
881 mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
883 /* Set the address wrapping */
884 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
885 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
886 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
887 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
889 /* Program outstanding MC requests */
890 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
892 mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
894 dma_desc = kzalloc(struct_size(dma_desc, sg_req, 1), GFP_NOWAIT);
898 dma_desc->bytes_req = len;
899 dma_desc->sg_count = 1;
900 sg_req = dma_desc->sg_req;
902 sg_req[0].ch_regs.src_ptr = 0;
903 sg_req[0].ch_regs.dst_ptr = dest;
904 sg_req[0].ch_regs.high_addr_ptr =
905 FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
906 sg_req[0].ch_regs.fixed_pattern = value;
907 /* Word count reg takes value as (N +1) words */
908 sg_req[0].ch_regs.wcount = ((len - 4) >> 2);
909 sg_req[0].ch_regs.csr = csr;
910 sg_req[0].ch_regs.mmio_seq = 0;
911 sg_req[0].ch_regs.mc_seq = mc_seq;
914 dma_desc->cyclic = false;
915 return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
918 static struct dma_async_tx_descriptor *
919 tegra_dma_prep_dma_memcpy(struct dma_chan *dc, dma_addr_t dest,
920 dma_addr_t src, size_t len, unsigned long flags)
922 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
923 struct tegra_dma_sg_req *sg_req;
924 struct tegra_dma_desc *dma_desc;
925 unsigned int max_dma_count;
928 max_dma_count = tdc->tdma->chip_data->max_dma_count;
929 if ((len & 3) || (src & 3) || (dest & 3) || len > max_dma_count) {
930 dev_err(tdc2dev(tdc),
931 "DMA length/memory address is not supported\n");
935 /* Set DMA mode to memory to memory transfer */
936 csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
937 /* Enable once or continuous mode */
938 csr |= TEGRA_GPCDMA_CSR_ONCE;
939 /* Enable IRQ mask */
940 csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
941 /* Enable the DMA interrupt */
942 if (flags & DMA_PREP_INTERRUPT)
943 csr |= TEGRA_GPCDMA_CSR_IE_EOC;
944 /* Configure default priority weight for the channel */
945 csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
947 mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
948 /* retain stream-id and clean rest */
949 mc_seq &= (TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK) |
950 (TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
952 /* Set the address wrapping */
953 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
954 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
955 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
956 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
958 /* Program outstanding MC requests */
959 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
961 mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
963 dma_desc = kzalloc(struct_size(dma_desc, sg_req, 1), GFP_NOWAIT);
967 dma_desc->bytes_req = len;
968 dma_desc->sg_count = 1;
969 sg_req = dma_desc->sg_req;
971 sg_req[0].ch_regs.src_ptr = src;
972 sg_req[0].ch_regs.dst_ptr = dest;
973 sg_req[0].ch_regs.high_addr_ptr =
974 FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (src >> 32));
975 sg_req[0].ch_regs.high_addr_ptr |=
976 FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
977 /* Word count reg takes value as (N +1) words */
978 sg_req[0].ch_regs.wcount = ((len - 4) >> 2);
979 sg_req[0].ch_regs.csr = csr;
980 sg_req[0].ch_regs.mmio_seq = 0;
981 sg_req[0].ch_regs.mc_seq = mc_seq;
984 dma_desc->cyclic = false;
985 return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
988 static struct dma_async_tx_descriptor *
989 tegra_dma_prep_slave_sg(struct dma_chan *dc, struct scatterlist *sgl,
990 unsigned int sg_len, enum dma_transfer_direction direction,
991 unsigned long flags, void *context)
993 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
994 unsigned int max_dma_count = tdc->tdma->chip_data->max_dma_count;
995 enum dma_slave_buswidth slave_bw = DMA_SLAVE_BUSWIDTH_UNDEFINED;
996 u32 csr, mc_seq, apb_ptr = 0, mmio_seq = 0;
997 struct tegra_dma_sg_req *sg_req;
998 struct tegra_dma_desc *dma_desc;
999 struct scatterlist *sg;
1004 if (!tdc->config_init) {
1005 dev_err(tdc2dev(tdc), "DMA channel is not configured\n");
1009 dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
1013 ret = tegra_dma_sid_reserve(tdc, direction);
1017 ret = get_transfer_param(tdc, direction, &apb_ptr, &mmio_seq, &csr,
1018 &burst_size, &slave_bw);
1022 /* Enable once or continuous mode */
1023 csr |= TEGRA_GPCDMA_CSR_ONCE;
1024 /* Program the slave id in requestor select */
1025 csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, tdc->slave_id);
1026 /* Enable IRQ mask */
1027 csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
1028 /* Configure default priority weight for the channel*/
1029 csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
1031 /* Enable the DMA interrupt */
1032 if (flags & DMA_PREP_INTERRUPT)
1033 csr |= TEGRA_GPCDMA_CSR_IE_EOC;
1035 mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
1036 /* retain stream-id and clean rest */
1037 mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
1039 /* Set the address wrapping on both MC and MMIO side */
1041 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
1042 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
1043 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
1044 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
1045 mmio_seq |= FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD, 1);
1047 /* Program 2 MC outstanding requests by default. */
1048 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
1050 /* Setting MC burst size depending on MMIO burst size */
1051 if (burst_size == 64)
1052 mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
1054 mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_2;
1056 dma_desc = kzalloc(struct_size(dma_desc, sg_req, sg_len), GFP_NOWAIT);
1060 dma_desc->sg_count = sg_len;
1061 sg_req = dma_desc->sg_req;
1063 /* Make transfer requests */
1064 for_each_sg(sgl, sg, sg_len, i) {
1068 mem = sg_dma_address(sg);
1069 len = sg_dma_len(sg);
1071 if ((len & 3) || (mem & 3) || len > max_dma_count) {
1072 dev_err(tdc2dev(tdc),
1073 "DMA length/memory address is not supported\n");
1078 mmio_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
1079 dma_desc->bytes_req += len;
1081 if (direction == DMA_MEM_TO_DEV) {
1082 sg_req[i].ch_regs.src_ptr = mem;
1083 sg_req[i].ch_regs.dst_ptr = apb_ptr;
1084 sg_req[i].ch_regs.high_addr_ptr =
1085 FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (mem >> 32));
1086 } else if (direction == DMA_DEV_TO_MEM) {
1087 sg_req[i].ch_regs.src_ptr = apb_ptr;
1088 sg_req[i].ch_regs.dst_ptr = mem;
1089 sg_req[i].ch_regs.high_addr_ptr =
1090 FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (mem >> 32));
1094 * Word count register takes input in words. Writing a value
1095 * of N into word count register means a req of (N+1) words.
1097 sg_req[i].ch_regs.wcount = ((len - 4) >> 2);
1098 sg_req[i].ch_regs.csr = csr;
1099 sg_req[i].ch_regs.mmio_seq = mmio_seq;
1100 sg_req[i].ch_regs.mc_seq = mc_seq;
1101 sg_req[i].len = len;
1104 dma_desc->cyclic = false;
1105 return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
1108 static struct dma_async_tx_descriptor *
1109 tegra_dma_prep_dma_cyclic(struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
1110 size_t period_len, enum dma_transfer_direction direction,
1111 unsigned long flags)
1113 enum dma_slave_buswidth slave_bw = DMA_SLAVE_BUSWIDTH_UNDEFINED;
1114 u32 csr, mc_seq, apb_ptr = 0, mmio_seq = 0, burst_size;
1115 unsigned int max_dma_count, len, period_count, i;
1116 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1117 struct tegra_dma_desc *dma_desc;
1118 struct tegra_dma_sg_req *sg_req;
1119 dma_addr_t mem = buf_addr;
1122 if (!buf_len || !period_len) {
1123 dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
1127 if (!tdc->config_init) {
1128 dev_err(tdc2dev(tdc), "DMA slave is not configured\n");
1132 ret = tegra_dma_sid_reserve(tdc, direction);
1137 * We only support cycle transfer when buf_len is multiple of
1140 if (buf_len % period_len) {
1141 dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n");
1146 max_dma_count = tdc->tdma->chip_data->max_dma_count;
1147 if ((len & 3) || (buf_addr & 3) || len > max_dma_count) {
1148 dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
1152 ret = get_transfer_param(tdc, direction, &apb_ptr, &mmio_seq, &csr,
1153 &burst_size, &slave_bw);
1157 /* Enable once or continuous mode */
1158 csr &= ~TEGRA_GPCDMA_CSR_ONCE;
1159 /* Program the slave id in requestor select */
1160 csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, tdc->slave_id);
1161 /* Enable IRQ mask */
1162 csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
1163 /* Configure default priority weight for the channel*/
1164 csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
1166 /* Enable the DMA interrupt */
1167 if (flags & DMA_PREP_INTERRUPT)
1168 csr |= TEGRA_GPCDMA_CSR_IE_EOC;
1170 mmio_seq |= FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD, 1);
1172 mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
1173 /* retain stream-id and clean rest */
1174 mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
1176 /* Set the address wrapping on both MC and MMIO side */
1177 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
1178 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
1179 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
1180 TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
1182 /* Program 2 MC outstanding requests by default. */
1183 mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
1184 /* Setting MC burst size depending on MMIO burst size */
1185 if (burst_size == 64)
1186 mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
1188 mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_2;
1190 period_count = buf_len / period_len;
1191 dma_desc = kzalloc(struct_size(dma_desc, sg_req, period_count),
1196 dma_desc->bytes_req = buf_len;
1197 dma_desc->sg_count = period_count;
1198 sg_req = dma_desc->sg_req;
1200 /* Split transfer equal to period size */
1201 for (i = 0; i < period_count; i++) {
1202 mmio_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
1203 if (direction == DMA_MEM_TO_DEV) {
1204 sg_req[i].ch_regs.src_ptr = mem;
1205 sg_req[i].ch_regs.dst_ptr = apb_ptr;
1206 sg_req[i].ch_regs.high_addr_ptr =
1207 FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (mem >> 32));
1208 } else if (direction == DMA_DEV_TO_MEM) {
1209 sg_req[i].ch_regs.src_ptr = apb_ptr;
1210 sg_req[i].ch_regs.dst_ptr = mem;
1211 sg_req[i].ch_regs.high_addr_ptr =
1212 FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (mem >> 32));
1215 * Word count register takes input in words. Writing a value
1216 * of N into word count register means a req of (N+1) words.
1218 sg_req[i].ch_regs.wcount = ((len - 4) >> 2);
1219 sg_req[i].ch_regs.csr = csr;
1220 sg_req[i].ch_regs.mmio_seq = mmio_seq;
1221 sg_req[i].ch_regs.mc_seq = mc_seq;
1222 sg_req[i].len = len;
1227 dma_desc->cyclic = true;
1229 return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
1232 static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
1234 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1237 ret = request_irq(tdc->irq, tegra_dma_isr, 0, tdc->name, tdc);
1239 dev_err(tdc2dev(tdc), "request_irq failed for %s\n", tdc->name);
1243 dma_cookie_init(&tdc->vc.chan);
1244 tdc->config_init = false;
1248 static void tegra_dma_chan_synchronize(struct dma_chan *dc)
1250 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1252 synchronize_irq(tdc->irq);
1253 vchan_synchronize(&tdc->vc);
1256 static void tegra_dma_free_chan_resources(struct dma_chan *dc)
1258 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1260 dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
1262 tegra_dma_terminate_all(dc);
1263 synchronize_irq(tdc->irq);
1265 tasklet_kill(&tdc->vc.task);
1266 tdc->config_init = false;
1268 tdc->sid_dir = DMA_TRANS_NONE;
1269 free_irq(tdc->irq, tdc);
1271 vchan_free_chan_resources(&tdc->vc);
1274 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
1275 struct of_dma *ofdma)
1277 struct tegra_dma *tdma = ofdma->of_dma_data;
1278 struct tegra_dma_channel *tdc;
1279 struct dma_chan *chan;
1281 chan = dma_get_any_slave_channel(&tdma->dma_dev);
1285 tdc = to_tegra_dma_chan(chan);
1286 tdc->slave_id = dma_spec->args[0];
1291 static const struct tegra_dma_chip_data tegra186_dma_chip_data = {
1293 .channel_reg_size = SZ_64K,
1294 .max_dma_count = SZ_1G,
1295 .hw_support_pause = false,
1296 .terminate = tegra_dma_stop_client,
1299 static const struct tegra_dma_chip_data tegra194_dma_chip_data = {
1301 .channel_reg_size = SZ_64K,
1302 .max_dma_count = SZ_1G,
1303 .hw_support_pause = true,
1304 .terminate = tegra_dma_pause,
1307 static const struct tegra_dma_chip_data tegra234_dma_chip_data = {
1309 .channel_reg_size = SZ_64K,
1310 .max_dma_count = SZ_1G,
1311 .hw_support_pause = true,
1312 .terminate = tegra_dma_pause_noerr,
1315 static const struct of_device_id tegra_dma_of_match[] = {
1317 .compatible = "nvidia,tegra186-gpcdma",
1318 .data = &tegra186_dma_chip_data,
1320 .compatible = "nvidia,tegra194-gpcdma",
1321 .data = &tegra194_dma_chip_data,
1323 .compatible = "nvidia,tegra234-gpcdma",
1324 .data = &tegra234_dma_chip_data,
1328 MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
1330 static int tegra_dma_program_sid(struct tegra_dma_channel *tdc, int stream_id)
1332 unsigned int reg_val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
1334 reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK);
1335 reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
1337 reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK, stream_id);
1338 reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK, stream_id);
1340 tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, reg_val);
1344 static int tegra_dma_probe(struct platform_device *pdev)
1346 const struct tegra_dma_chip_data *cdata = NULL;
1347 struct iommu_fwspec *iommu_spec;
1348 unsigned int stream_id, i;
1349 struct tegra_dma *tdma;
1352 cdata = of_device_get_match_data(&pdev->dev);
1354 tdma = devm_kzalloc(&pdev->dev,
1355 struct_size(tdma, channels, cdata->nr_channels),
1360 tdma->dev = &pdev->dev;
1361 tdma->chip_data = cdata;
1362 platform_set_drvdata(pdev, tdma);
1364 tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
1365 if (IS_ERR(tdma->base_addr))
1366 return PTR_ERR(tdma->base_addr);
1368 tdma->rst = devm_reset_control_get_exclusive(&pdev->dev, "gpcdma");
1369 if (IS_ERR(tdma->rst)) {
1370 return dev_err_probe(&pdev->dev, PTR_ERR(tdma->rst),
1371 "Missing controller reset\n");
1373 reset_control_reset(tdma->rst);
1375 tdma->dma_dev.dev = &pdev->dev;
1377 iommu_spec = dev_iommu_fwspec_get(&pdev->dev);
1379 dev_err(&pdev->dev, "Missing iommu stream-id\n");
1382 stream_id = iommu_spec->ids[0] & 0xffff;
1384 INIT_LIST_HEAD(&tdma->dma_dev.channels);
1385 for (i = 0; i < cdata->nr_channels; i++) {
1386 struct tegra_dma_channel *tdc = &tdma->channels[i];
1388 tdc->irq = platform_get_irq(pdev, i);
1392 tdc->chan_base_offset = TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET +
1393 i * cdata->channel_reg_size;
1394 snprintf(tdc->name, sizeof(tdc->name), "gpcdma.%d", i);
1399 vchan_init(&tdc->vc, &tdma->dma_dev);
1400 tdc->vc.desc_free = tegra_dma_desc_free;
1402 /* program stream-id for this channel */
1403 tegra_dma_program_sid(tdc, stream_id);
1404 tdc->stream_id = stream_id;
1407 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
1408 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
1409 dma_cap_set(DMA_MEMCPY, tdma->dma_dev.cap_mask);
1410 dma_cap_set(DMA_MEMSET, tdma->dma_dev.cap_mask);
1411 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
1414 * Only word aligned transfers are supported. Set the copy
1417 tdma->dma_dev.copy_align = 2;
1418 tdma->dma_dev.fill_align = 2;
1419 tdma->dma_dev.device_alloc_chan_resources =
1420 tegra_dma_alloc_chan_resources;
1421 tdma->dma_dev.device_free_chan_resources =
1422 tegra_dma_free_chan_resources;
1423 tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
1424 tdma->dma_dev.device_prep_dma_memcpy = tegra_dma_prep_dma_memcpy;
1425 tdma->dma_dev.device_prep_dma_memset = tegra_dma_prep_dma_memset;
1426 tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic;
1427 tdma->dma_dev.device_config = tegra_dma_slave_config;
1428 tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all;
1429 tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
1430 tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
1431 tdma->dma_dev.device_pause = tegra_dma_device_pause;
1432 tdma->dma_dev.device_resume = tegra_dma_device_resume;
1433 tdma->dma_dev.device_synchronize = tegra_dma_chan_synchronize;
1434 tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1436 ret = dma_async_device_register(&tdma->dma_dev);
1438 dev_err_probe(&pdev->dev, ret,
1439 "GPC DMA driver registration failed\n");
1443 ret = of_dma_controller_register(pdev->dev.of_node,
1444 tegra_dma_of_xlate, tdma);
1446 dev_err_probe(&pdev->dev, ret,
1447 "GPC DMA OF registration failed\n");
1449 dma_async_device_unregister(&tdma->dma_dev);
1453 dev_info(&pdev->dev, "GPC DMA driver register %d channels\n",
1454 cdata->nr_channels);
1459 static int tegra_dma_remove(struct platform_device *pdev)
1461 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1463 of_dma_controller_free(pdev->dev.of_node);
1464 dma_async_device_unregister(&tdma->dma_dev);
1469 static int __maybe_unused tegra_dma_pm_suspend(struct device *dev)
1471 struct tegra_dma *tdma = dev_get_drvdata(dev);
1474 for (i = 0; i < tdma->chip_data->nr_channels; i++) {
1475 struct tegra_dma_channel *tdc = &tdma->channels[i];
1477 if (tdc->dma_desc) {
1478 dev_err(tdma->dev, "channel %u busy\n", i);
1486 static int __maybe_unused tegra_dma_pm_resume(struct device *dev)
1488 struct tegra_dma *tdma = dev_get_drvdata(dev);
1491 reset_control_reset(tdma->rst);
1493 for (i = 0; i < tdma->chip_data->nr_channels; i++) {
1494 struct tegra_dma_channel *tdc = &tdma->channels[i];
1496 tegra_dma_program_sid(tdc, tdc->stream_id);
1502 static const struct dev_pm_ops tegra_dma_dev_pm_ops = {
1503 SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
1506 static struct platform_driver tegra_dma_driver = {
1508 .name = "tegra-gpcdma",
1509 .pm = &tegra_dma_dev_pm_ops,
1510 .of_match_table = tegra_dma_of_match,
1512 .probe = tegra_dma_probe,
1513 .remove = tegra_dma_remove,
1516 module_platform_driver(tegra_dma_driver);
1518 MODULE_DESCRIPTION("NVIDIA Tegra GPC DMA Controller driver");
1519 MODULE_AUTHOR("Pavan Kunapuli <pkunapuli@nvidia.com>");
1520 MODULE_AUTHOR("Rajesh Gumasta <rgumasta@nvidia.com>");
1521 MODULE_LICENSE("GPL");